--- vm_pageout.o ---
/usr/src/sys/vm/vm_pageout.c:369:14: error: variable 'object' set but not used [-Werror,-Wunused-but-set-variable]
  369 |         vm_object_t object;
      |                     ^
1 error generated.

diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index 0d054da34866..aab70b178e4c 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -366,7 +366,7 @@ vm_pageout_flushable(vm_page_t m)
 static int
 vm_pageout_cluster(vm_page_t m)
 {
-	vm_object_t object;
+	vm_object_t object __unused;
 	vm_page_t mc[2 * vm_pageout_page_count - 1];
 	int alignment, num_ends, page_base, pageout_count;